Zombieber
A person so obsessed with Justin Bieber they act as a mindless zombie when he is mentioned.
Radio: "Baby, baby, baby, ohhhh"
Girl: omgiusfiudvbdoihasdiudfkbihdfiomdfgoihdfghoisdgomg.
Dude 1: What the hell is wrong with her?
Dude 2: She's a major Zombieber, man.